CN1153634C - Fluidized bed-carrying drying classifier - Google Patents

Fluidized bed-carrying drying classifier Download PDF

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Publication number
CN1153634C
CN1153634C CNB998033901A CN99803390A CN1153634C CN 1153634 C CN1153634 C CN 1153634C CN B998033901 A CNB998033901 A CN B998033901A CN 99803390 A CN99803390 A CN 99803390A CN 1153634 C CN1153634 C CN 1153634C
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CN
China
Prior art keywords
above
mentioned
gas
coarse granule
granule material
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Application number
CNB998033901A
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Chinese (zh)
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CN1291920A (en
Inventor
市谷升
树雄
林功
村尾三树雄
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川崎重工业株式会社
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Priority to JP10305061A priority Critical patent/JP2996963B1/en
Priority to JP305061/1998 priority
Application filed by 川崎重工业株式会社 filed Critical 川崎重工业株式会社
Publication of CN1291920A publication Critical patent/CN1291920A/en
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Publication of CN1153634C publication Critical patent/CN1153634C/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B4/00Separating by pneumatic tables or by pneumatic jigs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26DRYING
    • F26BDRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B3/00Drying solid materials or objects by processes involving the application of heat
    • F26B3/02Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
    • F26B3/06Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried
    • F26B3/08Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air the gas or vapour flowing through the materials or objects to be dried so as to loosen them, e.g. to form a fluidised bed

Abstract

A fluidized bed-carrying drying classifier for drying a pulverized raw material and classifying the same into fine powder and coarse powder, comprising a porous plate type gas diffusion member (l2) provided on a lower side of a region forming a fluidized bed (l4) in a drying classifier body (l0), a hopper-shaped wind box (l6) provided on a lower side of the gas diffusion member, a dropping discharge unit (29) joined to a lower end of the wind box, a gas supply system (ll0) adapted to supply a fluidization gas, which serves as a drying hot blast and a classification gas, to the interior of the wind box (l6) and joined to a lower end of the wind box (16), a raw material introduction port (20) and a coarse particle discharge chute (24) which are joined to the drying classifier body (l0), and a gas discharge port (56) used to extract a fine powder-containing waste gas therefrom and provided at an upper portion of the drying classifier body (l0), the gas supply system (ll0) having a flow rate control unit (lll) for controlling diameters of particles to be classified, and a temperature control unit (112) for controlling the dryness thereof.

Description

The fluidized bed drying grading plant

Technical field

The present invention relates to a kind of fluidized bed drying grading plant that is used for the raw material that coal, slag etc. has a broad size distribution is carried out heated-air drying and air classification.

Background technology

As existing fluidized bed-carrying classifier, known for example having driven the separator of putting down in writing in the flat 6-343927 communique the spy, this device is to adjust Cut size (flow velocity of head room (freeboard)) by the flow velocity of adjusting the gas that forms fluid bed, thereby separate particles is become to be trapped in the coarse grain in the fluid bed and flies upward the particulate of head room from fluid bed, corase particles is discharged from fluid bed, and the waste gas that will contain micro mist simultaneously space is from the bed extracted out and is isolated micro mist with cyclone separator etc.

In addition, open in the flat 6-343927 communique also record above-mentioned spy, the assist gas that classification is used supplies in the discharge chute that is used for corase particles is discharged from fluid bed, discharges in the chute to prevent that micro mist below the Cut size from sneaking into.In addition, also record in above-mentioned communique, temperature and the heating measured in the fluid bed are used to form the gas of fluid bed, so that make the temperature of mensuration reach the temperature that can make raw material drying required.

In addition, under the situation of using raw materials such as fluidized bed processing coal, slag, because the particle of coal and slag etc. has very broad size distribution, therefore, even the below discharging jet oxidizing gases by gas distribution grid forms fluid bed, also can there be the not oversize grain of energy fluidizing.

In addition, known another kind of fluidized bed plant is recorded in the spy and opens in the flat 5-71875 communique, and in this device, the oversize grain of energy fluidizing shifts out in order to incite somebody to action not, inclined plane along gas distribution grid sprays gas obliquely upward, thereby makes oversize grain leap ramp (jampingboard).

In addition, open the spy and to disclose a kind of coarse granule material discharger in the flat 6-281110 communique, bottom at the gas distribution grid central portion of the fluid bed furnace of this device is provided with a recess, article one, the coarse granule material of perforation bellows is discharged chute with slotting being embedded in the above-mentioned recess on it, thereby the coarse granule material can be discharged from fluid bed by above-mentioned chute.

In addition, as the gas distribution grid of existing fluidized bed plant, known usually have two kinds of blister-type and porous templates.

In addition, open the spy and to disclose a kind of clinker calciner in the flat 6-287043 communique, wherein, below the gas distribution grid of fluidized bed granulating furnace, be provided with fluidized-solids roaster, the granulation thing is dropped into fluidized-solids roaster by the falling into mouth an of fluid bed in fluidized bed granulating furnace, being provided with one in calciner is used for gas is blown into ventilation unit in the fluidized bed granulating furnace by falling mouth, also be provided with a side insertion in addition and fall mouth and can increase and decrease the classification door of adjusting the aperture area that falls mouth, thereby can separate with micro mist by falling a mouthful particle that falls from body of heater.

; open that class fluidized bed-carrying classifier shown in the flat 6-343927 communique for resembling the spy; though can control the flow of the fluidizing gas that is used to adjust Cut size; but variation along with fluidizing gas flow (gas flow); be used to make the required temperature of raw material drying also to change thereupon, therefore can not obtain required aridity sometimes.That is to say, owing to, therefore can not side by side regulate Cut size and aridity gas flow and hot blast temperature not connection control independently of one another mutually.In addition, owing to only supply with the assist gas that classification is used, therefore can not obtain satisfied secondary grading effect during the micro mist below separating Cut size to the discharge chute of corase particles.In addition, porous template gas distribution grid is sometimes because at this moment former thereby necessary replacing such as wearing and tearing or corrosion just needs cost more time and expense.In addition, in the broad particle distribution of raw material and contain under the situation of more coarse granule material, near the fluidisation that causes that is trapped in the tight below of raw material throw-in part owing to the coarse granule material stops sometimes.

In addition,,, exist the coarse granule material not move and the problem stagnated, therefore be not suitable for the particle of operation size distribution broadness because the motionless zone of particle is bigger for existing known blister-type gas distribution grid.Also have bubble-cap wearing and tearing and the blocked problem of nozzle eyelet in addition.On the other hand, gas distribution grid for the porous template, also carry out correct design in view of the above as long as consider the uniformity of ejection, the static part of the particle between each nozzle and the factors such as height of injection, then no matter contain what coarse granule material, the capital reaches the full dose fluidisation, and this distribution grid has the performance of good abrasion resisting and the obstruction of anti-eyelet.On the other hand, the shortcoming of this distribution grid is to have more handled thing to fall by mesh, thereby exists dropping to be deposited in problem in the bellows.

In addition, open the device of flat 5-71875 communique record for the spy, must spray the very gas of high flow rate, its shortcoming is that the loss of pressure is big, and gas distribution grid weares and teares easily, needs more time and expense and change gas distribution grid.And, the complex structure of gas distribution grid, so its maintenance is pretty troublesome.In addition, the maximum particle diameter that can carry causes whole device to shut down owing to the coarse granule material is stuck in by the spouting velocity decision of gas sometimes on the gas distribution grid.In addition,, must increase the flow velocity of fluid bed, thereby increase the amount of dispersing of micro mist in order to carry corase particles really.

In addition, Te Kaiping 6-281110 communique has been put down in writing a kind of device that can make the coarse granule material connect the central portion of gas distribution grid and bellows and discharge, the complex structure of the device of this pattern, and can not guarantee the discharge of coarse granule material, the result, along with the continuity of time, the coarse granule material is piled up gradually, thereby makes the fluidisation variation of fluid bed itself.

In addition, Te Kaiping 6-287043 communique has been put down in writing a kind of mode that the classification mouth is set at the fluidized bed prilling furnace bottom, this mode is that the particle from the granulating furnace bottom is swum in air-flow on one side, discharged by classification on one side, but classification gas flow rate required when micro mist is carried out classification is less, therefore make particle flow into the classification portion in the chute simultaneously and classification portion is filled up, thereby cause grading effect not give full play to.

The present invention is in view of above-mentioned various situations, its objective is to provide a kind of like this fluidized bed drying grading plant, the raw material that this device utilizes fluid bed to come coal, slag etc. to be had broad size distribution carries out drying and classification simultaneously, can keep good and stable fluid bed, and can regulate aridity and Cut size simultaneously, and it is simple in structure, cheap, safety, transportation and maintenance all are easy to.

Another object of the present invention provides a kind of like this fluidized bed drying grading plant, this device can reduce significantly as the micro mist mixed volume in the corase particles of handled thing, thereby raising classification efficiency, also can keep stable fluid bed even in raw material, exist under the situation of more oversize grain or coarse granule material, and can prevent positively that the coarse granule material from sneaking in the handled thing.

Summary of the invention

In order to achieve the above object, fluidized bed drying grading plant of the present invention is a kind of device that can form fluid bed, this device is used for the raw material drying of powder shape and is classified into micro mist and coarse grain simultaneously, wherein, the downside of the fluid bed in this apparatus main body is provided with the gas distribution grid of porous template, downside at porous template gas distribution grid is provided with the bellows with funnel-shaped structure, the lower end of these infundibulate bellows is connected with the dropping discharger that can discharge the dropping that falls in the bellows continuously, be connected with at the sidepiece of bellows and be used for dryly infeeding gas supply system in the bellows with the fluidizing gas of gas effect with hot blast and classification having, end in main body is provided with a raw material input port that is used to drop into powder shape raw material, the other end in main body is connected with the discharge chute that is used to discharge dry coarse grain, be provided with the gas discharge outlet that is used to extract out the waste gas that contains micro mist on the top of main body, in gas supply system, be provided with the gas air quantity that infeeds in the bellows by adjusting and control the Cut size volume control device of (being equivalent to the head room flow velocity), in gas supply system, also be provided with by adjusting the hot blast temperature that infeeds the gas in the bellows accordingly simultaneously and control the temperature control equipment of aridity (with reference to figure 1) with adjusted air quantity.Should illustrate that the dropping discharger also can be designed to the control structure that batch (-type) is discharged according to the amount of falling of dropping.In addition,, consider, can use the stainless steel of SUS304 for example etc. from etch-proof viewpoint as the material of porous template gas distribution grid.

In the device of the invention described above, preferably be in raw material drop into tight-lipped below near fluid bed below porous template gas distribution grid place connect coarse granule material discharger so that discharge those particle diameters the fluid bed superficial linear velocity in a column with begin particle diameter that fluidizing velocity equates more than oversize grain (with reference to figure 4).In the case, when particle diameter accounts for more than the 8wt% for the treatment of capacity with oversize grain more than the particle diameter that the fluidisation commencing speed equates at the fluid bed superficial linear velocity in a column, preferably account for 3wt% when above, if use this coarse granule material discharger these oversize grains (coarse granule material) can be discharged, then can positively keep stable fluid bed.

In addition, in the device of the invention described above, preferably on the gas distribution grid of porous template, be equipped with and be used to prevent wearing and tearing of porous template gas distribution grid and the liner that can change.As the material of this liner, consider from anti-wear and etch-proof viewpoint, can use the stainless steel of SUS304 for example etc.

In the device of the invention described above, preferably be on the porous template gas distribution grid discharge chute one side end near the weir is set, simultaneously connect and be used to import the nozzle of classification gas discharging the chute place, so that those micro mists of having crossed above-mentioned weir are upwards blown and it is taken back in the main body.

In addition, in the device of the invention described above, preferably be on the porous template gas distribution grid discharge chute one side end near the weir is set, upside on this weir is provided with graded plate simultaneously, so that reduce the sectional area in the space between this graded plate and the weir, thereby the raising classification efficiency, and discharging chute place connection classification gas distributing nozzle, so that from flowing through between weir and the graded plate micro mist is taken back in the main body by means of gas.Should illustrate,, also graded plate can be set by suitably setting the height at the top that is in the discharge portion upside of discharging chute.

In the device of the invention described above, preferably has a kind of structure that can regulate the height of at least one side in weir and the graded plate, so that can regulate the classification amount by the space sectional area that changes between weir and the graded plate.Under the situation that can regulate height of weir, can regulate height of weir according to the kind of particle, just regulate the height of fluid bed.

In addition, in the device of the invention described above, preferably has a kind of structure that can regulate the height and the either party in the angle of graded plate, so that regulate the classification amount by the space sectional area that changes between weir and the graded plate.The structure optimization of this graded plate is a kind of both adjustable-heights, Flapper type graded plate that again can adjusting angle, and optimum carries out the secondary classification like this.In addition, under the situation of using the Flapper type graded plate, in main body, tilt, the micro mist of decline is returned in the main body by the lower end that makes graded plate.

In addition, in the device of the invention described above, preferably between the upper surface of the lower end on weir and porous template gas distribution grid, gap (slit) is set, so as to allow the coarse granule material from be therebetween by.

In the device of the invention described above, preferably will discharge chute inside by dividing plate separates, so that discharging chute near porous template gas distribution grid one side formation coarse granule material discharge chute, and the sidepiece of discharging chute at this coarse granule material is provided with the nozzle that is used to be blown into fluidizing gas, so that make the particle fluidisation of coarse granule material discharge chute internal upper part and make the coarse granule material optionally fall and discharge.In addition, the flow velocity of the fluidizing gas that is blown into from the fluidized gas nozzle is generally 1~3 times of speed Umf that fluid bed begins fluidisation, is preferably 1.5~2 times.When fluidisation commencing speed during less than above-mentioned lower limit, the coarse granule material is difficult to move, on the other hand, and when the fluidisation commencing speed surpasses above-mentioned higher limit, in discharging chute and the mix particles in the fluid bed too fierce, therefore be difficult to make the coarse granule material optionally to be discharged.

In addition, in the device of the invention described above, preferably a side adjacent with the discharge portion of discharging chute is provided with coarse granule material discharge portion on porous template gas distribution grid, and this coarse granule material discharge portion and coarse granule material discharge chute are connected, and preferably the sidepiece at this coarse granule material discharge chute is provided for being blown into the nozzle of fluidizing gas, so that make the particle fluidisation of coarse granule material discharge chute internal upper part and make the coarse granule material optionally fall and discharge.

In addition, in the device of the invention described above, preferably will discharge chute inside by dividing plate separates, so that discharging chute near porous template gas distribution grid one side formation coarse granule material discharge chute, and the sidepiece of discharging chute at this coarse granule material is provided with the nozzle that is used to be blown into fluidizing gas, so that make the particle fluidisation of coarse granule material discharge chute internal upper part and make the coarse granule material optionally fall and discharge, rake is formed at the bottom of discharging chute at this coarse granule material, in the dividing plate of the bottom of this rake one side, have at least a part to have the structure of sieve, in this discharge chute, be provided with the dividing plate that is used to form the space, so that form spatial portion, sneak into the coarse granule material and discharge small-particle in the chute and fallen above-mentioned spatial portion by sieve and taken back and discharge in the chute at the downside of this screen construction.

In the device of the invention described above, preferably make the upper end of said dividing plate be higher than the upper surface of porous template gas distribution grid.For example, under the situation of handling slag, the particle diameter of slag goods (coarse grain) is generally 2~3mm, the particle diameter of coarse granule material is generally 80~100mm, in order not allow the coarse granule material fall into the discharge chute of coarse grain, the upper end that can make dividing plate exceeds about 10~200mm than the upper surface of gas distribution grid.

Therefore the present invention can obtain following effect owing to have above-mentioned structure.

(1) regulates the air quantity of fluidizing gas so that reach required Cut size, then according to this Wind Coverage Calculation and control hot blast temperature so that obtain required aridity, therefore can infeed fluidizing gas according to the gas flow rate that can keep normal fluid bed, and can side by side regulate the aridity and the Cut size of product.

(2) owing to adopt the gas distribution grid of porous template, therefore do not have motionless and the phenomenon of corase particles stagnation of particle, can keep good and stable fluid bed.In addition, because porous template gas distribution grid simple in structure, so it is cheap, wearing and tearing or to stop up the phenomenon of eyelet all rare, and it is also easy to keep in repair.In addition, needn't adopt high spouting velocity to carry corase particles, and the pressure loss that distribution grid causes is also less.In addition, also can use less fluid bed flow velocity, so the amount of dispersing of micro mist is also less.

(3) porous template gas distribution grid can form uniform fluid bed, and it is simple in structure and inexpensive.And, owing on porous template gas distribution grid, the liner that can freely install and remove is installed, therefore when being worn, this gas distribution grid is very easy to maintenance.

(4) because bellows are infundibulate, and the dropping that falls in the bellows can be discharged by the dropping discharger continuously, so dropping can not be piled up in the bellows, and this has just guaranteed the stable of safe operation and fluid bed.

(5) owing to be provided with coarse granule material discharger near below the raw material input is tight-lipped, therefore when the large percentage of oversize grain or coarse granule material, can guarantee the normal fluidisation of full dose by a part of discharging in the oversize grain, thereby can keep stable running frequently.

(6) particle overflow and is arranged at the weir of porous template gas distribution grid end and is discharged to handled thing and discharges in the chute, under the situation of discharging chute importing classification gas to handled thing, owing to be blown into the effect that handled thing is discharged the classification gas in the chute, make micro mist be blown in the main body of return device, therefore can reduce significantly as the micro mist mixed volume in the coarse grain of handled thing, thereby can further improve classification performance.

(7) when be provided with above the weir graded plate and can be to the height of the height on weir and/or graded plate or situation that angle is regulated under, can change the space sectional area between graded plate and the weir, therefore can change the classification amount by the gas velocity that changes by handled thing discharge chute inflow main body one side, thereby can further improve classification efficiency.

(8) discharge under the situation of chute when the side in the handled thing discharge portion is provided with the coarse granule material, can prevent positively that the coarse granule material from sneaking in the corase particles as handled thing.In addition, compare with the perforation gas distribution grid makes the coarse granule material discharge with bellows existing mode, simple in structure, and because coarse granule material discharge chute does not connect bellows, therefore, even if under the situation of using high-temperature gas as processing gas, the coarse granule material is discharged chute and also can be exposed to chronically in the high-temperature gas, and is therefore very safe.

(9) owing to the coarse granule material of putting in the fluid bed finally concentrates near the outlet side, so the discharge of coarse granule material can be carried out efficiently.

(10) be provided with under the situation of screen construction such as diagrid, wire netting when discharging the chute bottom at the coarse granule material, can make those discharge the general particle (handled thing) of chute and turn back to particle and discharge chute one side along with the coarse granule material flows into the coarse granule material together, therefore can reduce the handled thing mixed volume in the coarse granule material, thereby make to have only the coarse granule material optionally to be discharged.

Simple declaration to accompanying drawing

Fig. 1 is the concise and to the point pie graph of system of the fluidized bed drying grading plant of expression the present invention the 1st embodiment.

Fig. 2 is a curve map, and it is illustrated in the fluidized bed drying grading plant of the present invention's the 1st embodiment, an example of the gas flow of fluidizing gas and the relation of Cut size.

Fig. 3 is a curve map, and it is illustrated in the fluidized bed drying grading plant of the present invention's the 1st embodiment, when with the gas flow of fluidized gas during as parameter, and an example of the gas temperature at device portal place and the relation of aridity.

Fig. 4 is the concise and to the point pie graph of the fluidized bed drying grading plant major part of expression the present invention the 2nd embodiment.

Fig. 5 is illustrated in the fluidized bed drying grading plant of the present invention's the 1st, the 2nd embodiment, liner is installed in the schematic plan view of the state on the porous template gas distribution grid.

Fig. 6 is illustrated in the fluidized bed drying grading plant of the present invention's the 1st, the 2nd embodiment, liner is installed in the concise and to the point amplification profile of the state on the porous template gas distribution grid.

Fig. 7 is the amplification profile schematic diagram of an example of the fluidized bed drying grading plant major part of expression the present invention the 3rd embodiment.

Fig. 8 is the amplification profile schematic diagram of another example of the fluidized bed drying grading plant major part of expression the present invention the 3rd embodiment.

Fig. 9 is the amplification profile schematic diagram of another example of the fluidized bed drying grading plant major part of expression the present invention the 3rd embodiment.

Figure 10 is the amplification profile schematic diagram of other example of the fluidized bed drying grading plant major part of expression the present invention the 3rd embodiment.

Figure 11 is the amplification profile schematic diagram of an example of the fluidized bed drying grading plant major part of expression the present invention the 4th embodiment.

Figure 12 is the handled thing discharge portion flat cutting face schematic diagram on every side among expression Figure 11.

Figure 13 is illustrated in the fluidized bed drying grading plant of the present invention's the 4th embodiment, the flat cutting face schematic diagram of another example around the handled thing discharge portion.

Figure 14 is the amplification profile schematic diagram of another example of the fluidized bed drying grading plant major part of expression the present invention the 4th embodiment.

The preferred plan that is used to carry out an invention

The following describes embodiment of the present invention, but the present invention is not subjected to any qualification of following embodiment, changes condition aptly and can implement the present invention yet.

Fig. 1 represents the fluidized bed drying grading plant of the present invention's the 1st embodiment.As shown in Figure 1, the bottom in main body 10 is provided with porous template gas distribution grid 12, and at the upside of this porous template gas distribution grid 12, the raw material (for example Shi fine coal) that drops into as object being treated becomes fluidizing agent and forms fluid bed 14.

Be provided with the bellows 16 of an infundibulate (vertical section be del haply and in the shape of its bottom opening) at the downside of porous template gas distribution grid 12, be connected with a dropping discharger 29 in the lower end of these infundibulate bellows 16, this device is used for discharging machine 28 and a dropping and discharging chute 18 and constitute falling into dropping that the particle in the bellows discharges continuously by one.

Be provided with one in an end of the main body of fluid bed 14 upsides and be used for raw material input port 20 that the powder shape raw material as object being treated is dropped into, the other end at fluid bed 14 is connected with a handled thing discharger 31, and this device is used for that by one the handled thing that handled thing (dry coarse grain) is discharged is discharged chute 24 and discharge machine 30 constitutes.As discharge machine 28,30, can use damper, Rotary feeder, utilize cam mechanism carry out switch the discharge machine, utilize the weight balance to carry out discharge machine of switch etc.

Dropping is discharged chute 18, handled thing is discharged chute 24 and all is connected with conveyer 32, and handled thing takes out from an end of this conveyer 32.As conveyer 32, can use screen mesh type conveyer belt, belt-type conveyer, chain conveyor etc.

To have dryly in order in bellows 16, infeeding, to connect a gas supply system 110 at the sidepiece of bellows 16 with hot blast and classification fluidizing gas with the gas effect.Gas supply system 110 comprise one by adjusting supply to gas air quantity in the bellows 16 control the volume control device 111 of Cut size and one by with adjusted the gas hot blast temperature that infeeds in the bellows 16 by volume control device 111 adjusted air quantity accordingly and control the temperature control equipment 112 of aridity.

The following describes the effect of fluidized bed drying grading plant shown in Figure 1.The powder shape raw material (object being treated) such as coal that will wet drops into by raw material input port 20, simultaneously, utilizes gas supply system 110 to infeed fluidizing gas to bellows 16.This fluidizing gas not only can form the fluid bed 14 of object being treated, can also be used to that object being treated is carried out heated-air drying and carries out air classification simultaneously.

In order to produce fluidizing gas, fuel and combustion air are infeeded in the heater 34 of hot-blast stove etc., utilize the burning of fuel to produce high-temperature hot-air, utilize the assist gas (waste gas after air or dry classification are handled etc.) that does not illustrate among the figure to dilute, then it is infeeded in the bellows 16 as hot blast so that its temperature is reduced to for example about 250~400 ℃.In detail, the temperature of head room for example is 50~80 ℃, and hot blast temperature for example is 250~400 ℃, in addition, for the purpose of accurately, can wait according to the input amount of raw material and target aridity (Δ moisture) to change flow or temperature.Under the situation of waste gas of using from fluidized bed drying grading plant etc. as the assist gas of dilution usefulness, because the oxygen concentration in this fluidizing gas is low, therefore, even when for example carrying out the damping of coal, also be safe.In addition, the 36 expression air-blasters of the symbol in Fig. 1.As heater 34, except the direct heater of hot-blast stove etc., can also use indirect heater.

Specifically, when utilizing device shown in Figure 1 to come aridity and Cut size controlled simultaneously, Cut size is by the flow velocity decision of head room, therefore should be in the numerical value input computing device 38 of the head room flow velocity that can obtain required Cut size, the temperature of the temperature of the head room 42 that records according to the pressure of the head room 42 that is recorded by pressure gauge 40 with by thermometer 41 and the fluidizing gas that recorded by thermometer 44 is carried out volume and is converted again, obtain the air quantity that need infeed the fluidizing gas in the bellows 16 in view of the above, in the flow value input flow rate indication accommodometer (FIC) 46 of calculating by calculation element 38, regulate flow control valve 48 by flow indication accommodometer (FIC) 46, whereby the fluidizing gas of the air quantity that can obtain required Cut size is infeeded in the bellows 16.For example, as shown in Figure 2, the gas flow of fluidized gas and Cut size amount are in linear relation, if with the required gas flow of the Cut size that can obtain 0.3mm as 100% (the about 1.5m/s of head room flow velocity), then when in the scope of gas flow 50~150% of fluidized gas, the numerical value of Cut size and gas flow is proportional.

Then, the temperature value input computing device 52 of the fluidized gas that infeeds bellows 16 that records from the flow value of flow indication accommodometer (FIC) 46 with by temperature indication accommodometer (TIC) 50, and the numerical value input computing device 52 of required aridity and raw material input amount, so that make the inlet moisture (dropping into the amount of moisture of raw material) and the difference of moisture content of outlet (amount of moisture of handled thing) meet the requirement of required aridity, calculate in view of the above and the corresponding hot blast temperature value that can obtain required aridity of the air quantity of fluidized gas.The hot blast temperature value that utilization is calculated by calculation element 52 is controlled the flow fuel control valve 54 that infeeds heater 34.For example, as shown in Figure 3, and different, gas flow is many more with the difference of fluidized gas gas flow (being respectively 80%, 100%, 120% in Fig. 2) for the gas temperature value that can obtain required aridity (inlet moisture-moisture content of outlet), and it is low more to be used to obtain the required gas temperature of same dried degree.

The fluidizing gas of adjusting air quantity and temperature in order to obtain required Cut size and aridity is infeeded in the bellows 16 and from porous template gas distribution grid 12 to be sprayed, when making object being treated fluidisation and drying, make the following particulate of Cut size disperse in the head room 42 and discharge from gas discharge outlet 56 together, the above coarse grain of Cut size is discharged from handled thing discharger 31 as handled thing (goods) in company with waste gas.In addition, the waste gas that contains micro mist of discharging from gas discharge outlet 56 is imported into the dust arrester (figure part omitted) of cyclone separator and/or bag collector etc., and herein, the micro mist in the waste gas is captured and separates.In addition, the particle that falls of the squit hole by porous template gas distribution grid 12 is discharged by dropping discharger 29.Though can discharge dropping continuously, when the negligible amounts of dropping, also can discharge dropping off and on.When discharging dropping continuously, discharge machine 28 is worked continuously.

Fig. 4 shows the major part of the fluidized bed drying grading plant of the present invention's the 2nd embodiment.As shown in Figure 4, the bottom in main body 10 is provided with porous template gas distribution grid 12, at the upside of this porous template gas distribution grid 12, becomes fluidizing agent and forms fluid bed 14 as the raw material of object being treated input.

Downside at porous template gas distribution grid 12 is provided with funnel shaped bellows 16, be connected with in the lower end of these infundibulate bellows 16 one by being used for dropping that the particle in the bellows discharges is continuously discharged machine 28 and dropping is discharged the dropping discharger 29 that chute 18 constitutes falling into.

An end at fluid bed 14 upsides is provided with raw material input port 20, in this raw material input port 20 tight below near fluid bed below porous template gas distribution grid 12 places, connect a coarse granule material discharger 27 that constitutes by coarse granule material discharge chute 22 and discharge machine 26.As discharge machine 26, can use damper, place feeder, utilize cam mechanism carry out switch the discharge machine, utilize discharge machine that the weight balance starts etc.

The other end at fluid bed 14 is connected with one by being used to discharge the handled thing discharge chute 24 of handled thing and the handled thing discharger 31 that discharge machine 30 constitutes.

The coarse granule material is discharged chute 22, dropping is discharged chute 18 and all is connected with conveyer 32 with handled thing discharge chute 24, contains the end taking-up of the handled thing of coarse granule material from this conveyer 32.Should illustrate that the coarse granule material is discharged chute 22 and also can be connected with conveyer 32, at this moment only need to form a structure of only the coarse granule material individually being taken out and get final product.

The effect of the major part of the fluidized bed drying grading plant that explanation now is shown in Figure 4, utilization forms the fluid bed 14 of object being treated from the fluidizing gas of porous template gas distribution grid 12 ejections, simultaneously with the object being treated drying, make the coarse granule material of coarse granule material by porous template gas distribution grid 12 fall that mouth falls and discharge via coarse granule material discharger 27.Gan Zao handled thing is discharged by handled thing discharger 31.Simultaneously, the particle that falls of the squit hole by porous template gas distribution grid 12 is then discharged by dropping discharger 29.

In the case, when particle diameter (is that particle more than 10~15mm) reaches 3~8wt% for the treatment of capacity when above when coal is dry at the particle diameter that the fluid bed superficial linear velocity in a column equals to begin fluidizing velocity, start coarse granule material discharger 27, so that discharge the coarse granule material in the object being treated.

Other structure is identical with the situation of the 1st embodiment with effect.

Fig. 5 and Fig. 6 are illustrated in the fluidized bed drying grading plant of the 1st, the 2nd embodiment of the invention described above, and the situation of liner is installed for the wearing and tearing that prevent porous template gas distribution grid.That is to say,, the liner 57 that can change (can install and remove) is installed for the wearing and tearing that prevent this porous template gas distribution grid 12 at the upside of porous template gas distribution grid 12.For example, a liner 57 that has with the squit hole 58 corresponding apertures 60 of porous template gas distribution grid 12 is divided into many small pieces, with counter-sunk screw 62 grades these liners that separate are fixed on the porous template gas distribution grid 12 then, squit hole 58 is alignd with aperture 60.Symbol 64 expression cut-off rules in Fig. 5.

Fig. 7 to Figure 10 represents the major part of the fluidized bed drying grading plant of the present invention's the 3rd embodiment.The feature of the present embodiment is the structure of the particle discharger in the fluidized bed drying grading plant.

As shown in Figure 7, discharge the position that the sidepiece of chute 24a is in bellows 16 at handled thing and be provided with a classification gas distributing nozzle 66, the while is provided with weir 70 be positioned at the end (downstream end of particle moving direction) of porous plate type gas distribution grid 12 in handled thing discharge portion 68 near.Between the upper surface of the lower end on weir 70 and porous template gas distribution grid 12, be provided with gap (slit) 72, so that under the situation that contains coarse granule material or major diameter particle, can allow these coarse granule materials or major diameter particle pass through.

In addition, be provided with graded plate 78 at 74 places, top of the main body 10 of handled thing discharge portion 68 upsides, so that improve classification efficiency by the sectional area that reduces the space 76 between this graded plate 78 and the weir 70.

The effect of the particle discharger in fluidized bed drying grading plant major part shown in Fig. 7 is described below with reference to Fig. 1.The object being treated that is made of the particle that contains micro mist is put on the porous type gas distribution grid 12 by raw material input port 20, simultaneously by porous template gas distribution grid 12 ejection gases so that particle fluidisation and form fluid bed 14, logistics is classified into waste gas and the coarse grain two parts that contain micro mist, coarse grain is discharged chute 24a and taking-up from handled thing discharge portion 68 as goods by handled thing.

The part of the fluidizing gas (bellows gas) in the bellows 16 is sprayed into by the classification gas distributing nozzle 66 that is in handled thing discharge chute 24a sidepiece as classification gas, this sprays into the space 76 of gas by weir 70 upsides and is injected in the head room 42 in the main body 10, thereby prevented that the minuteness particle 82 that descends from entering in the handled thing discharge portion 68 near main body side wall 80, simultaneously owing to spray into gas and from the population on weir 70 is crossed in overflow, flow through and particle is disperseed, and micro mist taken back in the main body 10, thereby improved classification performance.

In addition, can adjust the height on weir 70 according to the kind of object being treated.In addition, can come the interval (slit) of regulating weir 70 downsides according to the size of coarse granule material contained in object being treated or big footpath particle.And then the longitudinal cross-section that can change space 76 by the height (position of lower end) of adjusting graded plate 78 is long-pending, thereby makes gas flow rate reach optimum numerical value.In the present embodiment, the part that can utilize bellows gas is as the gas that sprays into that is injected in the handled thing discharge chute 24a.

Shown in Fig. 8, the sidepiece of discharging chute 24a at the handled thing position that is in bellows 16 inboards is not provided with classification gas distributing nozzle but at the position that the sidepiece that handled thing is discharged chute 24a is in bellows 16 outsides classification gas distributing nozzle 66a is set.In this example, utilize flow control valve for example baffle plate 84 can suitably regulate from installing the N that the outside infeeds 2Therefore the flow velocity and the flow of classification gases such as gas, air, burnt gas can be adjusted the classification rate, thereby can further be improved classification performance.Other structure is identical with the situation of Fig. 7 with effect.

In Fig. 9, be not provided with can adjust the height graded plate but a kind of rotary shield type graded plate 78a that can adjust the graded plate angle is set, so not only can change the sectional area in space 76, simultaneously can resemble the lower end that makes graded plate 78a as shown in Figure 9 and in main body 10, tilt, thereby can return minuteness particle 82 guiding that drop on the graded plate 78a in the main body 10.Other structure is identical with the situation of Fig. 7 with effect.

In Figure 10, the position that the sidepiece of discharging chute 24a at handled thing is in bellows 16 outsides is provided with classification gas distributing nozzle 66a, and is provided with the rotary shield type graded plate 78a that can adjust the graded plate angle.Other structure is identical with the situation of Fig. 7-Fig. 9 with effect.

More than other structures of Shuo Ming the present invention's the 3rd embodiment are identical with the situation of first embodiment with effect.Should illustrate, also can installation diagram 5 in the present embodiment and Fig. 6 shown in the liner that can change.

Figure 11 to Figure 14 shows the major part of the fluidized bed drying grading plant of the present invention's the 4th embodiment.The feature of the present embodiment is the structure of the particle discharger in the fluidized bed drying grading plant.

As Figure 11 and shown in Figure 12, the inner space that utilizes dividing plate 90 that handled thing is discharged chute 24b is separated into the particle discharge chute 88 that the coarse granule material that is in porous template gas distribution grid 12 1 sides is discharged chute 86 and is in main body 10 ends one side.That is to say that dividing plate 90 extends to the lower end of discharging chute haply always.In Figure 11 and Figure 12, symbol 92 expression coarse granule material discharge portions (coarse granule material outlet).In addition, the sidepiece at coarse granule material discharge chute 86 is provided with fluidized gas distributing nozzle 94.

Discharge chute 86 places at the coarse granule material and be connected with a coarse granule material discharge machine (figure part omitted), be connected with a particle discharge machine (figure part omitted) and discharge chute 88 places at particle.

The effect of the particle discharger in the fluidized bed drying grading plant major part shown in Figure 11, Figure 12 is described below with reference to Fig. 1.The object being treated that is made of the particle that contains the coarse granule material is put on the porous template gas distribution grid 12 by raw material input port 20, simultaneously by porous template gas distribution grid 12 ejection gases so that particle fluidisation and form fluid bed 14, with object being treated drying, classification, handled thing (coarse grain) is discharged chute 88 and taking-up from handled thing discharge portion 68 as goods by particle.In addition, the mobile layer of the 95 expression corase particleses of the symbol in Figure 11.

Spray into fluidizing gas by the fluidized gas nozzle 94 that is in coarse granule material discharge chute 86 sidepieces, impel the coarse granule material to discharge the particle fluidisation of chute 86 internal upper parts, and make coarse granule material 96 enter and drop in the coarse granule material discharge chute 86.As fluidizing gas, can use cold air, hot-air, burnt gas, N 2The inert gas of gas etc. sprays into fluidizing gas so that the fluidized gas speed of discharging chute 86 internal upper parts at the coarse granule material is equivalent to 1~3 times of fluidisation commencing speed Umf in fluid bed 14 by fluidized gas nozzle 94, is preferably 1.5~2 times.

In Figure 13, without dividing plate handled thing being discharged chute 24b separates, but near porous template dispersion plate 12 1 sides coarse granule material discharge portion (coarse granule material outlet) 92a is set in handled thing discharge portion 68, simultaneously, connect the coarse granule material at this coarse granule material discharge portion 92a place and discharge chute 86a.Other structure is identical with the situation of Figure 11, Figure 12 with effect.

In Figure 14, the part that the bottom of coarse granule material discharge chute 86 for example is in fluidized gas nozzle 94 downsides forms rake 98, the particle of this rake 98 is discharged an one of chute wall or is all formed screen construction portion 100, being provided with the space in handled thing is discharged chute 24b forms with dividing plate 104, so that the downside in this screen construction portion 100 forms spatial portion 102, sneak into the coarse granule material and discharge small-particle in the chute 86 by 100 classifications of screen construction portion and drop in the spatial portion 102, and then return handled thing by bypass and discharge among the chute 24b, return particle in more detail and discharge in the chute 88.As screen construction portion 100, can adopt diagrid or metal mesh structure.The advantage of this example is to have only the coarse granule material optionally to discharge.Other structure is identical with the situation of Figure 11, Figure 12 with effect.

In the present invention of above explanation, other structures of the 4th embodiment are identical with the situation of the 1st embodiment with effect.In addition, in the present embodiment, also can installation diagram 5 and Fig. 6 shown in the liner that can change.

                        Industrial applicibility

Fluidized bed drying grading plant of the present invention can be used for that coal, slag etc. is had broadness The granular raw material of size distribution carries out heated-air drying, and its air classification can be become particulate With coarse grain two parts.

Claims (12)

1, a kind of fluidized bed drying grading plant has the main body of the fluid bed of portion's formation within it, is used to make powder shape raw material drying and simultaneously raw material is classified into micro mist and coarse grain, it is characterized in that,
This device has:
Be arranged at fluid bed in the aforementioned body form regional downside porous template gas distribution grid,
Be arranged at above-mentioned porous template gas distribution grid downside the infundibulate bellows,
Be used to discharge the dropping discharger that falls into the dropping in the above-mentioned bellows and be connected in above-mentioned bellows lower end,
Be used for a kind of have dry with hot blast and classification infeed in the above-mentioned bellows with the fluidizing gas of gas effect and the gas supply system that is connected with above-mentioned bellows,
The raw material input port that is used to drop into above-mentioned powder shape raw material and be arranged at the aforementioned body place,
Be used to discharge dry coarse grain and be arranged at the aforementioned body place the discharge chute,
Be used to extract out the waste gas that contains micro mist and be arranged at the gas discharge outlet on aforementioned body top;
The above-mentioned gas feed system has: be used for by adjustment infeed gas air quantity in the above-mentioned bellows control the volume control device of Cut size, be used for by with adjusted the temperature control equipment that the hot blast temperature that infeeds the gas in the above-mentioned bellows is controlled aridity accordingly by the adjusted air quantity of above-mentioned volume control device.
2, the described fluidized bed drying grading plant of claim 1, wherein, be in above-mentioned raw materials drop into tight-lipped below near fluid bed form above-mentioned porous template gas distribution grid place below the zone, be connected be used for those particle diameters the fluid bed superficial linear velocity in a column with begin particle diameter that fluidizing velocity equates more than the coarse granule material discharger of oversize grain discharge.
3, claim 1 or 2 described fluidized bed drying grading plants wherein, are equipped with on above-mentioned porous template gas distribution grid and are used to prevent above-mentioned porous template gas distribution grid wearing and tearing and the liner that can change.
4, claim 1 or 2 described fluidized bed drying grading plants, wherein, be on the above-mentioned porous template gas distribution grid above-mentioned discharge chute one side end near be provided with the weir, be connected with simultaneously and be used for the particulate of crossing above-mentioned weir upwards blown and it is taken back classification gas distributing nozzle in the aforementioned body at above-mentioned discharge chute place.
5, claim 1 or 2 described fluidized bed drying grading plants, wherein, be on the above-mentioned porous template gas distribution grid above-mentioned discharge chute one side end near be provided with the weir, simultaneously the upside on above-mentioned weir be provided be used for by reduce and above-mentioned weir between the space sectional area improve the graded plate of classification efficiency, and be connected with at above-mentioned discharge chute place be used to make gas between above-mentioned weir and the above-mentioned graded plate by and the classification conductance that micro mist is taken back in the aforementioned body gone into nozzle.
6, the described fluidized bed drying grading plant of claim 5, wherein have a kind of can the adjustment, so that adjust the structure of classification amount by the space sectional area of change between above-mentioned weir and above-mentioned graded plate to either party in above-mentioned weir and the above-mentioned graded plate or the height of the two.
7, the described fluidized bed drying grading plant of claim 5, wherein have a kind of can the adjustment, so that adjust the structure of classification amount by changing sectional area between above-mentioned weir and above-mentioned graded plate to the height of above-mentioned graded plate and the either party in the angle or the two.
8, the described fluidized bed drying grading plant of claim 4 wherein, is provided with the gap that allows the coarse granule material to move between the upper surface of the lower end on above-mentioned weir and above-mentioned porous template gas distribution grid.
9, claim 1 or 2 described fluidized bed drying grading plants, wherein, utilization is separated the inside of above-mentioned discharge chute every the utmost point, discharge chute so that in above-mentioned discharge chute, form the coarse granule material, thereby and be provided with the fluidized gas that is used to impel the particle fluidisation of discharging the chute internal upper part that the coarse granule material is optionally fallen and discharges at the sidepiece that above-mentioned coarse granule material is discharged chute and be blown into nozzle at above-mentioned coarse granule material near above-mentioned porous template gas distribution grid one side.
10, claim 1 or 2 described fluidized bed drying grading plants, wherein, eliminating portion at above-mentioned discharge chute is provided with coarse granule material discharge portion near above-mentioned porous template gas dispersion plate one side, be connected with the coarse granule material in above-mentioned coarse granule material discharge portion and discharge chute, be blown into nozzle thereby be provided with the fluidized gas that is used to impel the particle fluidisation of discharging the chute internal upper part that the coarse granule material is optionally fallen and discharges at above-mentioned coarse granule material at the sidepiece that above-mentioned coarse granule material is discharged chute.
11, claim 1 or 2 described fluidized bed drying grading plants, wherein, separate the inside that utilizes dividing plate will discharge chute, discharge chute so that in above-mentioned discharge chute, form the coarse granule material near above-mentioned porous template gas distribution grid one side, thereby be provided with the fluidized gas that is used to impel the particle fluidisation of discharging the chute internal upper part that the coarse granule material is optionally fallen and discharges at the sidepiece that above-mentioned coarse granule material is discharged chute and be blown into nozzle at the coarse granule material, rake is formed at the bottom of discharging chute at above-mentioned coarse granule material, at least a portion at above-mentioned rake bottom baffles has screen construction, in above-mentioned discharge chute, be provided with space formation dividing plate, so that form spatial portion, sneak into above-mentioned coarse granule material and discharge small-particle in the chute and fallen above-mentioned spatial portion by sieve and return in the above-mentioned discharge chute thereby can make at the downside of above-mentioned screen construction.
12, the described fluidized bed drying grading plant of claim 9, wherein, the upper end of aforementioned barriers is higher than the upper surface of above-mentioned porous template gas distribution grid.
CNB998033901A 1998-10-27 1999-02-04 Fluidized bed-carrying drying classifier CN1153634C (en)

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AT251503T (en) 2003-10-15
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WO2000024530A1 (en) 2000-05-04
EP1044731A1 (en) 2000-10-18
EP1044731A4 (en) 2002-09-04
BR9907071A (en) 2000-10-17
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AU2186399A (en) 2000-05-15
US6298579B1 (en) 2001-10-09
DE69911915D1 (en) 2003-11-13
DE69911915T2 (en) 2004-08-19
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KR100376560B1 (en) 2003-03-17
KR20010033641A (en) 2001-04-25

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